it is the method which used for to check the concrete stability and to check the strength by without damage and partially damage to the concrete. it has no. of advantages and method use in it. it is the advance technology in concrete.

1. NON-DESTRUCTIVE TESTING
BY ; PARTH MAHETA (141210106020)

4. 1. Increases the safety and reliability of the product
during operation.
2. It decreases the cost of the product by reducing
scrap and conserving materials, labor and energy.
3. It enhances the reputation of the manufacturer as
a producer of quality goods.
4. NDT is also used widely for routine or periodic
determination of quality of the plants and
structures during service.

5. Cost Effectiveness:-
DESTRUCTIVE TESTING
= Huge cost initially has to put in for taking sample and
then to test it.
NDT
= Its very easy and simple process and a lot many
tests can be performed on concrete less than single amount
require for sampling of concrete.

7.  Rebound Hammer Test
 Penetration Resistance Method
 Maturity Test Method
 Permeation Test Method
 Ultrasonic pulse velocity test

8.  It is done to find out the compressive strength of the
concrete.

9. The test is based on principle that the rebound of an
elastic mass depends on the hardness of the surface
against which its mass strikes.
When the plunger of the hammer is pressed against
the surface of the concrete, the spring-controlled mass
rebounds and extent of such a rebound depends upon
the surface hardness of concrete .
the rebound value is read from a graduated scale and
is designated as the rebound no. of rebound index. The
compressive strength can be read directly from the
graph provided on the body of the hammer.

10. Relation between compressive strength and
Rebound No.
 If a value of hammer rebound or a rebound no. is
higher then simultaneously strength of the concrete is
also increased.(Increasing Manner)

11. Interpretation of the Test Results

12. Factors Affecting Test Results
Type of cement
Type of Aggregate
Surface condition and Moisture Content Of concrete
Curing and Age of Concrete
Carbonation of Concrete Surface

13. PENETRATIONRESISTANCEMETHOD
 Explore the strength properties of concrete using
previously established correlations.
 Measuring the probe's depth of penetration provides
an indication of concrete compressive strength by
referring to correlations.
 The tests are considered to be non-destructive despite
the disturbance of the concrete during penetration.

14.  The most commonly used penetration resistance
method is the “Windsor probe system”.
 The no.of factors contributing to within test variability
are fewer than those of other NDT procedures such as
surface hardness methods.
 It is quick, cheap and simple to operate.

15. Factors Affecting Test Results
 Operator Error
 Equipment Error
 Size of Aggregates
 Heterogeneous Nature of Concrete

16.  The maturity method is a NDT technique for
determining strength gain of concrete based on the
measured temperature history during curing.
 The maturity function is presented to quantify the
effects of time and temp.
 Temperature v/s time is recorded by means of
thermocouples inserted into fresh concrete.
 The measured time history could be used to compute
a maturity index which provides a concrete strength as
a function of time.
MaturityTest

17.  Aggregate properties
 Cement properties
 Water-cement ratio
 Curing temperature
Factors Affecting Test Results

18. AS PER IS: 13311- (Part 1)-1992

19.  This technique is used for the
detection of internal surface
defects in sound conducting
materials.
 In this method high frequency
sound waves are introduced
into a material and they are
reflected back from surface and
flaws.
 Reflected sound energy is
displayed v/s time, and
inspector can visualize a c/s of
the specimen showing the
depth of features.

20. The underlying principle of this test is:-
 The method consists of measuring the time of travel of
an ultrasonic pulse passing through the concrete being
Tested.
 Comparatively higher velocity (about 3 to 5km/sec.) is
obtained when concrete quality is good in terms of
density, uniformity , homogeneity etc.
Frequency of Pulse = 15 - 175 kHz

21. Factors Affecting Test Results
 Smoothness of Surface
 Path length of pulse velocity
 Temp. of Concrete
 Moisture Content of Concrete
 Presence of Reinforced Steel
 Stress Level in Concrete

22. Applications of the Ultrasonic testing
 Thickness and lengths up to 30 feet can be tested.
 Measurement of concrete uniformity.
 To detect cracks & Voids are in any structures.
 Measurement thickness of concrete roads or
slabs.
 Measurement Elastic Modulus.
 Studies on Durability of concrete.

23. Relation Between compressive
strength and Ultrasonic Pulse

24. The quality of concrete in terms of uniformity, incidence
or absence of internal flaws, cracks and segregation,
etc. , indicative of the level of workmanship employed,
can thus be assessed using the guidelines given below,
which have been evolved for characterizing the quality
of concrete in structures in terms of the ultrasonic pulse
velocity.
Interpretation of the Test Results

25. To estimate strength
and hardness of the concrete in the cover region.
measure homogeneity ,uniformity
compactibility and presence of crack or void, thus
representing durability of concrete.
 To evaluate in situ compressive strength of concrete.
o know the
corrosion activity.

26.  NDT techniques provide cost-effective and reliable
analysis under realistic conditions.
 Each NDT technique has certain capabilities and
limitations and often more than one technique is
used to cover various parts.
 Increasing availability of robotic scanners improve
the speed of testing large surfaces, hence
minimizing the testing time.

27. Thank You